docs: Fix hierarchy in subcommand reference

README.md

@@ -5,7 +5,6 @@ Simple Tape File System (STFS), a file system for tapes and tar files.
 ⚠️ STFS has not yet been audited! While we try to make it as secure as possible, it has not yet undergone a formal security audit by a third party. Please keep this in mind if you use it for security-critical applications. ⚠️
 
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@@ -161,7 +160,7 @@ Global Flags:
 Use "stfs inventory [command] --help" for more information about a command.
 ```
 
-### Key Generation
+#### Key Generation
 
 ```shell
 $ stfs keygen --help